Sunday, January24, 2021
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Marine Weather and Tides
Boston, MA

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 7:03AMSunset 4:49PM Sunday January 24, 2021 4:55 AM EST (09:55 UTC) Moonrise 2:03PMMoonset 4:37AM Illumination 84% Phase: Waxing Gibbous; Moon at 11 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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ANZ230 Boston Harbor- 416 Am Est Sun Jan 24 2021
.gale warning in effect through this afternoon...
Today..NW winds 25 to 30 kt with gusts up to 35 kt. Waves around 2 ft.
Tonight..NW winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 30 kt. Waves around 2 ft.
Mon..NW winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft.
Mon night..NW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Waves around 2 ft.
Tue and Tue night..N winds 5 to 10 kt. Waves 1 foot or less.
Wed through Thu night..N winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height.
ANZ200 416 Am Est Sun Jan 24 2021
Synopsis for massachusetts and rhode island coastal waters.. Low pres near the canadian maritimes with high pres near western new york will maintain gale-force northwest winds across most waters today. High pres then builds across the waters for Monday with easing winds. Weak low pres passes into the southern waters on Tues, with high pres returning for Wed. Powerful low pres develops near the mid-atlantic waters Thurs. For additional information on possible hazardous weather for the week ahead, please visit www.weather.gov/boston/ehwo.


7 Day Forecast for Marine Location Near Boston, MA
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location: 42.36, -71.02     debug


Area Discussion for - Boston, MA
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FXUS61 KBOX 240736 AFDBOX

Area Forecast Discussion National Weather Service Boston/Norton MA 236 AM EST Sun Jan 24 2021

SYNOPSIS. Cold and blustery this morning with possible sub-zero wind chills. Winds slacken Monday as high pressure builds into Southern New England. Though a couple periods of light snow are possible thru midweek, seasonable and dry weather generally prevails. A powerful area of low pressure near the mid- Atlantic waters on Thursday may bring breezy conditions to southern parts of MA and RI, though it looks to otherwise pass harmlessly to our south. A brief shot of much colder air then filters in for late in the week.

NEAR TERM /THROUGH TODAY/. Not much change to the weather features today. Our region remains positioned between a low pressure over the Maritimes and a high pressure across the central Appalachians. This will maintain a cold and gusty northwest flow through most of today. Winds should become less gusty and strong late today as this high pressure edges closer to our region.

Not seeing much moisture nearby. While there may be a few clouds over land, there will be plenty of sunshine. Clouds will be more of a feature across the outer coastal waters, where some ocean- effect clouds linger.

High temperatures today are expected to be pretty close to what we saw yesterday, which will be slightly below normal. With the gusty winds, wind chills will be mainly in the single digits above zero and teens after daybreak.

SHORT TERM /TONIGHT THROUGH 6 PM MONDAY/. High pressure to our west will become more of a factor in our weather. Dry and chilly weather continues, but winds will continue to diminish tonight into Monday

Not ideal radiational cooling conditions tonight, but it will still be cold enough for most, and near normal for late January. Increasing mid and high clouds ahead of a warm front Monday, with near normal high temperatures expected.

LONG TERM /MONDAY NIGHT THROUGH SATURDAY/. Highlights .

* Light, decorative snow Tue/Tues nite for western MA/CT.

* Dry weather then prevails, but turning breezy on Thurs as a powerful cyclone near the mid-Atlantic waters passes well to our south.

* Much colder air for Fri/Sat, potentially with low wind chills.

Details:

Monday Night into Tuesday Night:

500 mb height rises and sfc ridge will initally be in place Mon night. The mid-level height rises will shift a NW-SE axis of mid- level confluent flow to the north into ME/NH. Looking at mostly clear skies and dry conditions for Mon night with modest NE winds increasing slightly late. Lows mainly in the 20s.

A deamplifying 500 mb shortwave trough is still progged to move into the lower Great Lakes Tues and into PA/southern NY Tues night. This feature will draw some moisture NE along a sfc warm front into western MA and parts of northern CT late Tues, and perhaps into central MA and RI Tues night. However a number of factors support the idea that this will likely be more of a decorative/mood snow at best. For one, weakening/deamplifying upper level energy won't support robust accumulation. The moisture that is available is rather limited, and some of that will have to initially go to top- down column saturation given initially dry air in place. Mid-level confluent flow over the eastern third of the CWA into ME/NH will also limit the eastern/northeast extent of precip. Will continue to focus highest PoPs (Chance range) from later Tues into Tues night for areas mainly SW of a Orange-Worcester-Providence line. GFS remains further north and is among the wettest guidance in terms of QPF, though did note the ECMWF increased its QPF a bit. Model QPF consensus is less than two-tenths of an inch, and part of this will go to saturating the column. With limited snow growth parameters as well, locally up to a couple inches of new snow accumulation, though most in western MA/CT into western RI will see coatings to an inch. Highs in the 30s, with lows in the 20s.

Wednesday into Wednesday Night:

High pressure returns for Wed, though some RH left behind will keep skies more partly to mostly cloudy. While most of the interior should be dry, may have some ocean effect precip for Cape Cod and adjacent coastal southeast MA later Wed into Wed night. Highs mainly in the 30s for most to near 40 for southeast New England. Lows mainly in the 20s.

Thursday/Thursday Night:

Models continue to advertise a well-defined shortwave disturbance moving through the mid-Atlantic region Thurs, which induces coastal cyclogenesis near the Carolinas/Chesapeake Bay area. Rapid deepening into a powerful (sub-980 mb) cyclone is reflected across most of the guidance, though good clustering in EPS/GEFS/GEPS ensemble member lows showing a progged track south and east of 40N/70W.

While this cyclone looks to pass to our south thru Thurs night, fairly robust northerly pressure gradient between the cyclone's circulation and high pressure established over New England could lead to fairly breezy to gusty NE wind conditions. This is particularly the case the further south one goes. Have left populated NBM winds/wind gusts as is, which brings some 30 mph gusts to the South Coast and Cape Cod. Will have to see just how close the circulationg gets and how strong the cyclone deepens but could see a need to increase winds/gusts more than currently reflected. At the moment, breezy conditions and mostly dry weather (outside of ocean- effect precip for coastal MA) look to be the only effects for our area.

Friday into Saturday:

Potent closed low near Hudson Bay digs southward through New England on Friday. This feature looks to be associated with a strong shot of colder, modified-Arctic air. Advertised a dry forecast for now with limited moisture for this closed low to work with. However it turns quite cold with 925 mb temps plummeting to around -14 to near -20C on Fri into Fri night. Highs mainly in the 20s with lows single digits to teens, about 10 degrees below normal. With northerly winds around 15-20 mph through the night, we could be talking about low wind chills that could be worthy of headlines. Looks to be a brief period of below-normal temps though; while still below-average temps for Sat, the cold air mass does start to modify.

AVIATION /08Z SUNDAY THROUGH THURSDAY/. Forecaster Confidence Levels.

Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent.

Today through Monday: High confidence.

VFR. Strong gusty NW winds continuing today, then diminishing tonight into Monday.

KBOS TAF . High confidence in TAF.

KBDL TAF . High confidence in TAF.

Outlook /Monday Night through Thursday/ .

Monday Night: VFR. Breezy.

Tuesday: Mainly VFR, with local IFR possible. Slight chance SN.

Tuesday Night: Mainly VFR, with local IFR possible. Chance SN.

Wednesday: Mainly VFR, with local IFR possible.

Wednesday Night: Mainly VFR, with areas IFR possible. Breezy. Slight chance SHSN.

Thursday: MVFR/IFR conditions possible. Windy with local gusts up to 30 kt. Slight chance SHSN.

MARINE. Gale force NW gusts continue this morning with rough seas and freezing spray across most of the waters. Threat of moderate freezing spray should diminish from south to north this morning. More freezing spray expected across the eastern coastal waters tonight into Monday morning.

Gale force gusts expected to diminish this evening, at which time the Gale Warnings will be replaced with Small Craft Advisories. Seas will slowly subside tonight into Monday.

Outlook /Monday Night through Thursday/ .

Monday Night: Winds less than 25 kt. Areas of seas approaching 5 ft.

Tuesday: Winds less than 25 kt. Slight chance of snow. Local visibility 1 to 3 nm.

Tuesday Night: Winds less than 25 kt. Local visibility 1 to 3 nm.

Wednesday: Winds less than 25 kt.

Wednesday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Slight chance of rain showers, slight chance of snow showers. Local visibility 1 to 3 nm.

Thursday: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas. Slight chance of rain showers. Areas of visibility 1 to 3 nm.

BOX WATCHES/WARNINGS/ADVISORIES. CT . None. MA . Wind Advisory until 1 PM EST this afternoon for MAZ022. RI . None. MARINE . Freezing Spray Advisory until 7 AM EST this morning for ANZ231>234. Gale Warning until 9 PM EST this evening for ANZ231>235-237- 250-251-254>256. Gale Warning until 6 PM EST this evening for ANZ230-236. Freezing Spray Advisory until 10 AM EST this morning for ANZ251.

SYNOPSIS . Belk/Loconto NEAR TERM . Belk SHORT TERM . Belk LONG TERM . Loconto AVIATION . Belk/Loconto MARINE . Belk/Loconto


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
BHBM3 - 8443970 - Boston, MA 2 mi56 min 38°F1012.5 hPa
44013 - BOSTON 16 NM East of Boston, MA 20 mi36 min WNW 25 G 33 23°F 42°F1013.3 hPa13°F
44029 - Buoy A0102 - Mass. Bay/Stellwagen 27 mi112 min WNW 21 G 33 21°F 4 ft1011.5 hPa
FOXR1 - 8454000 - Providence, RI 43 mi56 min NNW 8.9 G 18 18°F 41°F1015.7 hPa
PVDR1 44 mi56 min WNW 14 G 20 18°F 1015.7 hPa2°F
BLTM3 - 8447387 - Borden Flats Light at Fall River, MA 46 mi56 min WNW 17 G 23 20°F 1015.4 hPa
FRVM3 - 8447386 - Fall River, MA 46 mi56 min 20°F 40°F1015.8 hPa
FRXM3 47 mi56 min 21°F 9°F
IOSN3 - Isle of Shoals, NH 47 mi56 min WNW 31 G 37 17°F 1009.5 hPa (-1.3)-1°F
44018 - SE Cape Cod 30NM East of Nantucket, MA 48 mi36 min WNW 33 G 41 25°F 43°F1009.7 hPa16°F
CPTR1 - 8452944 - Conimicut Light, RI 48 mi56 min WSW 19 G 22 18°F 40°F1015.1 hPa
BGXN3 - Great Bay Reserve, NH 49 mi71 min W 12 16°F 1012 hPa4°F

Wind History for Providence, RI
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Boston, Logan International Airport, MA1 mi62 minW 16 G 2710.00 miFair17°F1°F49%1013.6 hPa
East Milton, MA11 mi65 minWNW 19 G 27 miBreezy13°F2°F61%1013.7 hPa
Norwood, Norwood Memorial Airport, MA14 mi63 minWNW 7 G 1810.00 miFair18°F1°F47%1014.6 hPa
Beverly, Beverly Municipal Airport, MA16 mi63 minWNW 18 G 2710.00 miFair and Breezy18°F-0°F45%1012.1 hPa
Laurence G Hanscom Field Airport, MA16 mi65 minW 1210.00 miFair16°F2°F54%1015.3 hPa

Link to 5 minute data for KBOS

Wind History from BOS (wind in knots)
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1 day agoSW7SW4W7W7W6W7W8--W10W11W12
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2 days agoNW7W6SW5SW6S8S8SW8S10SW14SW10S8S4SW4SW3S3SW4SW7SW4SW8SW5SW7SW3SW11SW7

Tide / Current Tables for Chelsea St. Bridge, Chelsea River, Massachusetts
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Chelsea St. Bridge
Click for Map
Sun -- 01:31 AM EST     1.91 feet Low Tide
Sun -- 03:37 AM EST     Moonset
Sun -- 07:04 AM EST     Sunrise
Sun -- 07:45 AM EST     9.26 feet High Tide
Sun -- 01:02 PM EST     Moonrise
Sun -- 02:17 PM EST     1.14 feet Low Tide
Sun -- 04:48 PM EST     Sunset
Sun -- 08:26 PM EST     8.12 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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3.12.122.94.35.97.799.28.67.35.73.82.11.21.42.33.75.47.1887.25.9

Tide / Current Tables for Boston Harbor, Massachusetts Current
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Boston Harbor
Click for Map
Sun -- 01:36 AM EST     0.00 knots Slack
Sun -- 03:37 AM EST     Moonset
Sun -- 05:00 AM EST     0.93 knots Max Flood
Sun -- 07:04 AM EST     Sunrise
Sun -- 07:34 AM EST     -0.00 knots Slack
Sun -- 12:04 PM EST     -1.16 knots Max Ebb
Sun -- 01:02 PM EST     Moonrise
Sun -- 02:11 PM EST     0.00 knots Slack
Sun -- 04:47 PM EST     Sunset
Sun -- 05:32 PM EST     0.94 knots Max Flood
Sun -- 08:11 PM EST     -0.00 knots Slack
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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-0.9-0.50.30.70.80.90.70.3-0.2-0.5-0.8-1-1.2-0.9-0.20.50.70.90.90.50.1-0.3-0.6-0.8

Weather Map
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GEOS Local Image of    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerous of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.